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4x-2x+1+2=2x-2-x-x
2x+3=-2
2x=-5
x=-5/2
2.- x+(x+3)(x-3)=3+x(x+1)
x+x²-9= 3+x²+x
-9=3
es un absurdo
4x-2x+1+2=2x-2-x-x
4x-2x-2x+x+x=-1-2-2
2x=-5
x=-5/2
b)
x+x^2-9=3+x^2+x
x+x^2-x^2-x=3+9
0x=12
no tiene solucion esta ecuacion